Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3796ecacf9f3df3…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 21:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc82da92e26dd649dcb34d2d50147e3e SHA-1: 7e54b57c0a9d95db0966a993dc924b898cb30a9c SHA-256: b3796ecacf9f3df39889679d4c3ee8ca4b129491d2737f90143d1393cc931640
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=federalist+78+worksheet+answers PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f0eb4394f2ed5e7947b58fa68ca8074f/bevavilepunufomavodumi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57deb6e933---fotagufa.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/52678150185.pdfIn PDF document text
    • http://centrons.com/uploaded/file/37770611660b48ab77a9b6.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f8ca0e67db9ab83a390616599f44d8f4/47178015039.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071158910810---90144417351.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210615184827.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/1946536655.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/37723359614.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/91804409712.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a82d1973f---tefimixof.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210630010539.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/61142049204.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcfd24bb1---lazuwipegefazijiragizu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97991a985---megagumonujaxogeje.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4677672c2c487f351a46553c863a8940/govebemotoxex.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/sikugaperaz.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210810_66F005BB6942393D.pdfIn PDF document text
    • https://computerzone.pk/file/fabejuvo.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/viwalabimimifenopuxug.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/586b670335c12bcee3497cc81dd41326/daxuwija.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/44013963891.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fea05edc3---paxabixesidula.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/gitebatibesuwuso.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/68297472134.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/80611169679.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 10760 bytes
SHA-256: 7ae9d5eac91087ab41cbaaec7991ee4a3a3965d217513cd8a1a72e7ffe4c15e2
font_02_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 17000 bytes
SHA-256: f87e49622889437650fc49389c79e76bdc323801bd3eacee6313e73e2eb16c44

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